Ключевые слова: air, atmosphere, background, black, burn, chemical, chemistry, city, climate, contamination, damage, danger, dangerous, dioxide, dirty, disposal, ecology, emission, emissions, environment, environmental, evaporation, exhaust, explosion, factory, future, global, industrial, industry, manufacturing, ozone, pipe, plant, pollution, power, problem, production, refinery, regulations, safety, screensaver, sky, smog, smoke, substances, textured, toxic, view, warming, waste,